great thread on why IRC died, via @cjd : https://social.nasqueron.org/@deadsuperhero/75268
(note that the "ircv3" project mentioned is not irc3, but a new project, from this century)
While I certainly agree that IRC is not anywhere near as ubiquitous as it once was, it's definitely not dead. I'm in a bunch of active IRC channels on Freenode.
"I appreciate SDF but it's a general-purpose server and the name doesn't make it obvious that it's about art." - Eugen Rochko